CN101691839B - Ultra-low resistance acid-type microemulsion plugging removal and stimulation technology for low permeability oil well - Google Patents
Ultra-low resistance acid-type microemulsion plugging removal and stimulation technology for low permeability oil well Download PDFInfo
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Abstract
The invention relates to a plugging removal and stimulation method for a low permeability oil well. The ultra-low resistance acid-type microemulsion is prepared by the following components: 10%-25% of acid, 5%-20% of oil, 5%-25% of alcohol, 0.5%-5% of surfactant, 0.5%-3% of inorganic salt, 0.3-1.5% of corrosion inhibitor and the balance water. The method comprises the following steps: injecting the prepared microemulsion in the oil bearing reservoir of the oil well, closing the oil well to react for 4-10h, cleaning the oil well, flowing the reaction exhaust liquor back, and completing the oil well to perform normal production. The ultra-low resistance acid-type microemulsion used by the invention has thermodynamic stability, is a high dispersive acid-type microemulsion with good solubilization capacity, has ultra-low surface and interfacial tensions and good solubilization capacity and can increase the dispersive capacity of crude in water and the emulsification and peeling function to oil film; the microemulsion also has good dissolubility in water or oil and good fluidity due to high carrying capability and low seepage resistances so that the oil yield of the oil well is increased and the water content is reduced; the liquid surface tension in oil reservoir is reduced and the flow resistance of the crude is lowered so that the mining rate of the crude is increased and the plugging removal and stimulation of the oil well can be realized.
Description
Technical field
The present invention relates to a kind of technology of oil extraction, specifically, is the removal and stimulation method for the low permeability oil field oil well.
Background technology
The microemulsion technology is a kind of liquid nanometer material preparation technology in essence, is a kind of emerging material science and technology.This dispersion has very high interfacial area, very strong property of solubilizing, stable thermodynamic behaviour and to the strong solubility of indissoluble material, have fabulous divergent function, infiltration function, dissolving function, adsorption function and heat and mass function, therefore be widely used in the leading-edge field such as the displacement of reservoir oil and nano materials research in bio-pharmaceuticals, coating, cleaning, fuel, tertiary oil recovery.
The acidification to dispel block technology is one of Main Yield-increasing technology in oilfield exploitation, at home and abroad has in the record of related documents: various emulsified acids, mud acid, Compound-acid, mixed acid, micella acid, the heat-technical systems such as sour composite blockage relieving.Developed acid/oil type microemulsion system abroad in the eighties, be used for acidifying and obtain certain effect; Medium to high permeable oil field, east using basic microemulsion floodings in tertiary oil recovery such as domestic grand celebration, triumph have been obtained effect preferably.Domestic have the test of various hyposmosis oil well plugging removal and stimulation technologies in recent years, but be used for hyposmosis oil well plugging removal and stimulation there are no other ripe low-resistance acid-type microemulsion technology, also without relevant chemical agent product in marketing and sale.
The low permeability oil field oil well typically refers to oilfield reservoir matrix sillar permeability and is (0.1～50) * 10
-3μ m
2Oil well, be commonly referred to as low permeability pay.According to the actual production feature, can further be divided into low permeability oil field according to the oil reservoir mean permeability: (the oil reservoir mean permeability is 10.1～50 * 10 to general low permeability oil field
-3μ m
2), (the oil reservoir mean permeability is 1.1～10.0 * 10 to extra permeability oilfield
-3μ m
2), (the oil reservoir mean permeability is 0.1～1.0 * 10 for the ultra-low penetration oil field
-3μ m
2).Studies show that: seepage flow and the pore structure of hyposmosis, extra-low permeability oil reservoirs have particularity, and significantly different from middle and high infiltration oil field, this makes the application of conventional oilfield stimulation technology run into very large difficulty.The technical system acid solution frictional resistances such as emulsified acid, Compound-acid, micella acid are large, should not be used for seepage flow characteristics and pore structure and middle and high infiltration oil field remarkable different hyposmosis, extra-low permeability oil gas field.
Summary of the invention
The object of the invention is to, a kind of technology of hyposmosis oil well plugging removal and stimulation is provided.
The present invention is achieved in that component acid, oil, alcohol, surfactant, inorganic salts, corrosion inhibiter and water, and is composite at the oilfield scene, adds successively in reservoir, fully mixes standing reaction 15～120min; Inject the oil reservoirs of oil well with the high pressure pump truck; After closing well reaction 4～10h, well-flushing returns row's reaction residue, and completion drops into normal production.
Said acid refers to whole in inorganic acid salt and organic acid sulfamic acid, hydrochloric acid, hydrofluoric acid, formic acid, acetic acid, citric acid or the mix acid liquor more than 2 kinds (melting concn) wherein.
Said oil refers to a kind or 2 kinds in normal heptane, n-dodecane or kerosene, diesel oil, crude oil.
Said alcohol refers to that chemical formulation is the aliphatic alcohols of R-OH.
Surfactant, refer to alkylaryl sulfonate class surfactant ZF-SA16, fatty alcohol ethers such as APEO OP series non-ionic surfactants, the modified carboxylic acid salt, alhpa olefin, sulfuric ester, phosphoric acid ester anion or zwitterionic surfactant, alkanolamide surfactant, the compound of one or more in fluorocarbon surfactant.
Said inorganic salts refer to one or more in chloride inorganic salts ammonium chloride, sodium chloride, potassium chloride.
Said corrosion inhibiter refers to the polyquaternary amine salt corrosion inhibiter for oil well acidation.
Said water refers to can be used for the qualified clear water of oil-water well acidifying, pressure break.
Above-mentioned acid, oil, alcohol, surfactant, inorganic salts, corrosion inhibiter and water, weight proportion therebetween is: 10%～25%: 5%～20%: 5%～25%: 0.5%～5%: 0.5%～3%: 0.3～1.5%: surplus.
The low-resistance acid-type microemulsion that the present invention is used, composite form transparent or translucent greatly at normal temperatures, particle diameter are at 10-100nm, and Thermodynamically stable, isotropic even profit dispersion are the acid-type microemulsions of a kind of high dispersive, strong solubilising.Have ultralow table, interfacial tension and good solubilising, can increase the dispersibility of crude oil in water, strengthen effect is peeled off in the emulsification of oil film; Have water breakthrough water-soluble, see oil be dissolved in the good solubility of oil and high carry, the good fluidity of low filtrational resistance, with the strong dispersiveness of microemulsion, permeability with to the strong solubility of indissoluble material, remove oil layer blocking and pollute; Increase the displacement power in medium and small duct in oil reservoir and be subjected to fluence, improving low permeability pay nearly well seepage flow situation and oil reservoir intake profile, the seepage flow characteristics that improves low permeability pay increases well oil output, moisture reduction; Oil reservoir inner fluid surface tension is reduced,
Reduce the flow resistance of crude oil, improve the crude oil recovery ratio.Realize the plugging removal and stimulation of oil well.
Compare with the emulsified acid of routine etc., the present invention's low-resistance acid-type microemulsion stability used is high, and decentralized photo (acid) diameter is little, and flow resistance is little, and the row of returning is easy, more can be applicable to the formation characteristics of low permeability oil field.
Organic obstructions such as the organic contamination that the construction operations such as the present invention's low-resistance acid-type microemulsion used is can corrosion siliceous, inorganic scale obstruction and drilling well in irony, the reservoir such as calcareous, pressure break produce, natural plant gum, can greasy dirt, the dirty particulate solubilising row of returning in the microemulsion micella, remove comprehensive, the compound obstruction in hypotonic duct, stratum.
The present invention's low-resistance acid-type microemulsion used has wetting action, can change the wetability of rock surface, reduces crude oil at the adhesive force of rock surface.The one, can prevent well the organic deposition again of heavy, extend oil layer unblocking measure period of validity; The 2nd, can change the duct wetability, lower blockages relieving fluid inlet in macropore, can delay acid and oil-gas Layer rock reaction speed in blockages relieving fluid, increase chemical agent degree of adhesion in the duct, lowered and slowed down the high fluence that is subjected to of oozing macropore, construction well water amount is reduced.
The specific embodiment:
Below, by three embodiment, the present invention will be further described.
Long certain the extra permeability oilfield W9-14 oil well of celebrating of embodiment 1., the average in-place permeability 4.659 * 10 of this well
-3μ m
2, the removal and stimulation method of employing low-resistance acid-type microemulsion:
At first, each component roping of dosing to the oilfield operation field, is added in reservoir successively, fully mix, preparation de-plugging agent liquid 15 sides, standing reaction 15min is stand-by.Preparation the present invention de-plugging agent liquid weight used is, mix acid liquor with sulfamic acid, hydrochloric acid, acetic acid, citric acid: 10% (melting concn), fuel oil: 20%, isopropyl alcohol: 5%, Sulfonates ZF-SA16 and APEO O P-10 surfactant: 5.0%, corrosion inhibiter: 0.5%, ammonium chloride: 1.5%, and the clear water low-resistance acid-type microemulsion that is mixed with high dispersive, has ultralow table, interfacial tension.Be lowered to the well stimulation tubing string after oil well active water circulation well cleanup is thorough, pass through connecting line with the high pressure pump truck, just be circulated to oil well import and export water quality for active water consistent, just replacing into the agent of low-resistance acid-type microemulsion plugging removal to the oil reservoir position, seat packer (or closing sleeve gate) is just squeezing the agent of residue low-resistance acid-type microemulsion plugging removal, clamp-on again the active water displacement fluid to oil reservoir, closing well reaction 10h, well-flushing returns row's reaction residue, and completion puts into production.
After adopting plugging removal and stimulation of the present invention, this, production fluid was by 1.42m well day
3Rise to 3.02m
3, a day produce oil is increased production to 2.18t by 0.74t, moisturely drops to 14.0% by 75.0%; The average individual well oily 2.22t that increases day by day, amount of increase in production reaches 300%, and period of validity reached more than 500 days.
Long certain the low permeability oil field D75-20 oil well of celebrating of embodiment 2., the average in-place permeability 18.393 * 10 of this well
-3μ m
2, the removal and stimulation method of employing low-resistance acid-type microemulsion:
At first press the design of oil well production increasing job engineering, each component roping of dosing to oilfield plugging removal and stimulation operation field, is added in reservoir successively, fully mix, preparation de-plugging agent liquid 25 sides, standing reaction 60min is stand-by.Preparation the present invention de-plugging agent liquid used, concrete weight is the mix acid liquor with hydrochloric acid, hydrofluoric acid, formic acid, citric acid: 25% (melting concn), normal heptane and crude oil mixed liquor: 5%, ethanol: 25%, alhpa olefin and fluorine carbon surfactant: 0.5%, corrosion inhibiter: 3.0%, sodium chloride: 0.3%, and the clear water low-resistance acid-type microemulsion that is mixed with high dispersive, has ultralow table, interfacial tension.Be lowered to the well stimulation tubing string after oil well active water circulation well cleanup is thorough, pass through connecting line with the high pressure pump truck, just be circulated to oil well import and export water quality for active water consistent, just replacing into the agent of low-resistance acid-type microemulsion plugging removal to the oil reservoir position, the seat packer is just squeezing the agent of residue low-resistance acid-type microemulsion plugging removal, clamp-on again the active water displacement fluid to oil reservoir, closing well reaction 4h, well-flushing returns row's reaction residue, and completion puts into production.After adopting plugging removal and stimulation of the present invention, this, production fluid was by 5.53m well day
3Rise to 16.71m
3, a day produce oil is increased production to 4.58t by 1.51t, the average individual well oily 3.03t that increases day by day, and amount of increase in production reaches 303.3%, and period of validity reached more than 300 days.
Embodiment 3. certain extra permeability oilfield Y64-33 oil well, the average in-place permeability 6.94 * 10 of this well
-3μ m
2, the removal and stimulation method of employing low-resistance acid-type microemulsion:
At first press the design of oil well production increasing job engineering, each component roping of dosing to oilfield plugging removal and stimulation operation field, is added in reservoir successively, fully mix, preparation de-plugging agent liquid 20 sides, standing reaction 120min is stand-by.Preparation the present invention de-plugging agent liquid used, concrete weight is the mix acid liquor with hydrochloric acid, hydrofluoric acid, acetic acid, citric acid: 18% (melting concn), n-dodecane: 5%, another name for: 15%, alkanolamide and phosphoric acid ester surfactant: 2.5%, corrosion inhibiter: 0.8%, ammonium chloride: 1.0%, and the clear water low-resistance acid-type microemulsion that is mixed with high dispersive, has ultralow table, interfacial tension.Be lowered to the well stimulation tubing string after oil well active water circulation well cleanup is thorough, pass through connecting line with the high pressure pump truck, just be circulated to oil well import and export water quality for active water consistent, just replacing into the agent of low-resistance acid-type microemulsion plugging removal to the oil reservoir position, the seat packer is just squeezing the agent of residue low-resistance acid-type microemulsion plugging removal, clamp-on again the active water displacement fluid to oil reservoir, closing well reaction 6h, well-flushing returns row's reaction residue, and completion puts into production.
After adopting plugging removal and stimulation of the present invention, this, production fluid was by 1.04m well day
3Rise to 5.68m
3, a day produce oil is increased production to 3.41t by 0.80t; The average individual well oily 2.61t that increases day by day, amount of increase in production reaches 426.25%, and period of validity surpasses more than 400 days.
Claims (4)
1. be used for the low-resistance acid-type microemulsion plugging removal and stimulation method of low permeability oil field oil well, it is characterized in that: with component acid, oil, alcohol, surfactant, inorganic salts, corrosion inhibiter and clear water, weight proportion therebetween: 10%～25%: 5%～20%: 5%～25%: 0.5%～5%: 0.5%～3%: 0.3～1.5%: surplus, composite at the oilfield scene, add successively in reservoir, fully mix standing reaction 15～120min; Inject the oil reservoirs of oil well; After closing well reaction 4～10h, well-flushing returns row's reaction residue, and completion drops into normal production;
Described microemulsion, its particle diameter are 10-100nm;
Described alcohol refers to that chemical formulation is the aliphatic alcohols of R-OH;
Described corrosion inhibiter refers to the polyquaternary amine salt corrosion inhibiter for oil well acidation.
2. low-resistance acid-type microemulsion plugging removal and stimulation method according to claim 1, it is characterized in that: said oil refers to a kind or 2 kinds in normal heptane, n-dodecane or kerosene, diesel oil, crude oil.
3. low-resistance acid-type microemulsion plugging removal and stimulation method according to claim 1, it is characterized in that: said surfactant, refer to alkylaryl sulfonate class surfactant, fatty alcohol ether class APEO OP series non-ionic surfactants, the modified carboxylic acid salt, alhpa olefin, sulfuric ester, phosphoric acid ester anion or zwitterionic surfactant, the alkanolamide surfactant, the compound of one or more in fluorocarbon surfactant.
4. low-resistance acid-type microemulsion plugging removal and stimulation method according to claim 1, it is characterized in that: said inorganic salts refer to one or more in chloride inorganic salts ammonium chloride, sodium chloride, potassium chloride.
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